Gapless spin liquid of an organic triangular compound evidenced by thermodynamic measurements

Satoshi Yamashita, Takashi Yamamoto, Yasuhiro Nakazawa (), Masafumi Tamura and Reizo Kato
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Satoshi Yamashita: Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan.
Takashi Yamamoto: Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan.
Yasuhiro Nakazawa: Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan.
Masafumi Tamura: Faculty of Science and Technology, Tokyo University of Science, Yamazaki, Noda, Chiba 278-8510, Japan.
Reizo Kato: RIKEN, Hirosawa 2-1

Nature Communications, 2011, vol. 2, issue 1, 1-6

Abstract: Abstract In frustrated magnetic systems, long-range ordering is forbidden and degeneracy of energy states persists, even at extremely low temperatures. Under certain conditions, these systems form an exotic quantum spin-liquid ground state, in which strongly correlated spins fluctuate in the spin lattices. Here we investigate the thermodynamic properties of an anion radical spin liquid of EtMe3Sb[Pd(dmit)2]2, where dmit represents 1,3-dithiole-2-thione-4,5-dithiolate. This compound is an organic dimer-based Mott insulator with a two-dimensional triangular lattice structure. We present distinct evidence for the formation of a gapless spin liquid by examining the T-linear heat capacity coefficient, γ , in the low-temperature heat capacity. Using comparative analyses with κ-(BEDT-TTF)2Cu2(CN)3, a generalized picture of the new spin liquid in dimer-based organic systems is discussed. We also report anomalous enhancement of γ, produced by a kind of criticality inherent to the Pd(dmit)2 phase diagram.

Date: 2011
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DOI: 10.1038/ncomms1274

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